/*
 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <delay_timer.h>
#include <mmio.h>

uintptr_t sp804_base_addr;

#define SP804_TIMER1_LOAD    (sp804_base_addr + 0x000)
#define SP804_TIMER1_VALUE    (sp804_base_addr + 0x004)
#define SP804_TIMER1_CONTROL    (sp804_base_addr + 0x008)
#define SP804_TIMER1_BGLOAD    (sp804_base_addr + 0x018)

#define TIMER_CTRL_ONESHOT    (1 << 0)
#define TIMER_CTRL_32BIT    (1 << 1)
#define TIMER_CTRL_DIV1        (0 << 2)
#define TIMER_CTRL_DIV16    (1 << 2)
#define TIMER_CTRL_DIV256    (2 << 2)
#define TIMER_CTRL_IE        (1 << 5)
#define TIMER_CTRL_PERIODIC    (1 << 6)
#define TIMER_CTRL_ENABLE    (1 << 7)

/********************************************************************
 * The SP804 timer delay function
 ********************************************************************/
uint32_t sp804_get_timer_value(void)
{
    return mmio_read_32(SP804_TIMER1_VALUE);
}

/********************************************************************
 * Initialize the 1st timer in the SP804 dual timer with a base
 * address and a timer ops
 ********************************************************************/
void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops)
{
    assert(base_addr != 0);
    assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value);

    sp804_base_addr = base_addr;
    timer_init(ops);

    /* disable timer1 */
    mmio_write_32(SP804_TIMER1_CONTROL, 0);
    mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX);
    mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX);

    /* enable as a free running 32-bit counter */
    mmio_write_32(SP804_TIMER1_CONTROL,
            TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE);
}
